Question

two resistors of same material,same length, and same diameter are first connected in series and then in parallel in a circuit across the same potential difference. find the ratio of heat developed in series and parallel combination​

Answer 1

Ratio of heat produced will be equal to ratio of effective resistance......by joules law

Let the resistance of each piece of wire be R

Case1,

ER1=R+R=2R

Case2,

1/ER2=1/R+1/R

ER2=R/2

Ratio of heat

H1:H2=ER1:ER2=R:R/2

H1:H2=2:1